he's identified as 33-year-old christopher jordan dorner. he was fired from the police force five years ago. and now he may be seeking revenge. dorner is accused of shooting three los angeles police officers early this morning, one of them fatally. plus he's the prime suspect in a double killing over the weekend. cnn's paul vercammen is covering the manhunt. and law enforcement analyst mike brooks is here in los angeles with me. paul, start with you. bring us up to speed of this hunt for this ex-cop described as armed and extremely dangerous. >> reporter: extremely dangerous, don. this is a desperate search right now. and as of right now i'm in riverside. you can see the police officers behind me. they blocked off part of this intersection. no sign of dorner. when you talked about armed and dangerous, what they are worried about is he alluded to having a barrett 50 cal meaning a semiautomatic sniper rifle. beyond these police officers, if you look down the street, don, this is where dorner allegedly ambushed, shot and killed one officer and